"Cell phones, self-driving cars and virtual-reality headsets have something in common. They all send radio waves through the air. Our bodies can't feel these invisible signals, says Scott Ransom. “We can't hear them. We can't see them. But all our devices are using them,” notes this astronomer who works at the National Radio Astronomy Observatory. It’s in Charlottesville, Va."
"Radio waves are a type of electromagnetic radiation. This spectrum of energy also includes the light we can see, along with X-rays and ultraviolet light. But radio waves have much lower energy than these other signals. That means radio signals travel through the air as very long, stretched-out waves."